Turbocharger Boost Control Position Sensor A Performance - Stuck Low
Position sensor A reports a value stuck near the low end of its travel even when the actuator is commanded to move. Either the actuator is mechanically stuck closed (wastegate jammed shut, VGT vanes seized at minimum opening) or the sensor itself is pegged low. Boost is uncontrolled — overboost on diesels with VGT, underboost on wastegate-stuck systems.
Affected components
- Turbo actuator position sensor a
- Turbo actuator
Common causes
- High likelihood: Actuator mechanically stuck near low end
- Medium likelihood: Sensor pegged low
Possible symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.